Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é a Nacionalidade de Anna Khlistunova?
 ###Tabelas: CREATE TABLE editions_feature_grid (editions_feature_grid_id AUTO_INCREMENT PRIMARY KEY, Product VARCHAR, Extensions VARCHAR, Projects templates VARCHAR, MSDN integration VARCHAR, Debugging VARCHAR, Profiling VARCHAR, IntelliTrace VARCHAR, Unit test VARCHAR, Code coverage VARCHAR, Test impact analysis VARCHAR, Load testing VARCHAR, Lab management VARCHAR, Architecture and modelling VARCHAR, Windows Phone development VARCHAR) CREATE TABLE medal_count_by_country (medal_count_by_country_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Nation VARCHAR, Gold INT, Silver INT, Bronze INT, Total INT) CREATE TABLE heats (heats_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Heat INT, Lane INT, Name VARCHAR, Nationality VARCHAR, Time VARCHAR) CREATE TABLE doubles_5 (doubles_5_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Tournament VARCHAR, Surface VARCHAR, Partnering VARCHAR, Opponents VARCHAR, Score VARCHAR) CREATE TABLE undersecretaries (undersecretaries_id AUTO_INCREMENT PRIMARY KEY, Romanised name VARCHAR, Chinese name VARCHAR, age at appointment INT, Foreign nationality VARCHAR, Portfolio attachment VARCHAR, Govt salary VARCHAR)  
SELECT Nationality FROM heats WHERE Name = anna khlistunova